<!doctype html>
<html>

<head>
    <title>Radar Chart</title>
    <script src="../dist/Chart.bundle.js"></script>
    <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <style>
    canvas {
        -moz-user-select: none;
        -webkit-user-select: none;
        -ms-user-select: none;
    }
    </style>
</head>

<body>
    <div style="width:75%">
        <canvas id="canvas"></canvas>
    </div>
    <button id="randomizeData">Randomize Data</button>
    <button id="addDataset">Add Dataset</button>
    <button id="removeDataset">Remove Dataset</button>
    <button id="addData">Add Data</button>
    <button id="removeData">Remove Data</button>
    <script>
    var randomScalingFactor = function() {
        return Math.round(Math.random() * 100);
    };
    var randomColorFactor = function() {
        return Math.round(Math.random() * 255);
    };
    var randomColor = function(opacity) {
        return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
    };

    var config = {
        type: 'radar',
        data: {
            labels: ["Eating", "Drinking", "Sleeping", "Designing", "Coding", "Cycling", "Running"],
            datasets: [{
                label: "Skip first dataset",
                borderColor: 'rgb(255, 0, 0)',
                backgroundColor: "rgba(255,255,0,0.5)",
                pointBackgroundColor: "rgba(220,220,220,1)",
                data: [NaN, randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()]
            }, {
                label: "Skip mid dataset",
                borderColor: 'rgb(255, 0, 255)',
                backgroundColor: "rgba(0, 255, 0, 0.5)",
                pointBackgroundColor: "rgba(151,187,205,1)",
                hoverPointBackgroundColor: "#fff",
                pointHighlightStroke: "rgba(151,187,205,1)",
                data: [randomScalingFactor(), randomScalingFactor(), NaN, randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()]
            },{
                label: "Skip last dataset",
                borderColor: 'rgb(0, 255, 255)',
                backgroundColor: "rgba(0, 0, 255, 0.5)",
                pointBackgroundColor: "rgba(151,187,205,1)",
                hoverPointBackgroundColor: "#fff",
                pointHighlightStroke: "rgba(151,187,205,1)",
                data: [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), NaN]
            }]
        },
        options: {
            title:{
                display:true,
                text:"Chart.js Radar Chart - Skip Points"
            },
            elements: {
                line: {
                    tension: 0.0,
                }
            },
            scale: {
                beginAtZero: true,
                reverse: false
            }
        }
    };

    window.onload = function() {
        window.myRadar = new Chart(document.getElementById("canvas"), config);
    };

    $('#randomizeData').click(function() {
        $.each(config.data.datasets, function(i, dataset) {
            dataset.data = dataset.data.map(function() {
                return randomScalingFactor();
            });

        });

        window.myRadar.update();
    });

    $('#addDataset').click(function() {
        var newDataset = {
            label: 'Dataset ' + config.data.datasets.length,
            borderColor: randomColor(0.4),
            backgroundColor: randomColor(0.5),
            pointBorderColor: randomColor(0.7),
            pointBackgroundColor: randomColor(0.5),
            pointBorderWidth: 1,
            data: [],
        };

        for (var index = 0; index < config.data.labels.length; ++index) {
            newDataset.data.push(randomScalingFactor());
        }

        config.data.datasets.push(newDataset);
        window.myRadar.update();
    });

    $('#addData').click(function() {
        if (config.data.datasets.length > 0) {
            config.data.labels.push('dataset #' + config.data.labels.length);

            $.each(config.data.datasets, function (i, dataset) {
                dataset.data.push(randomScalingFactor());
            });

            window.myRadar.update();
        }
    });

    $('#removeDataset').click(function() {
        config.data.datasets.splice(0, 1);
        window.myRadar.update();
    });

    $('#removeData').click(function() {
        config.data.labels.pop(); // remove the label first

        $.each(config.data.datasets, function(i, dataset) {
            dataset.data.pop();
        });

        window.myRadar.update();
    });
    </script>
</body>

</html>
